Lubricant pump for hydraulically operated machine tools



Nov.15,1949

E.H.KOCHER LUBRICANT PUMP FOR HYDRAULICALLY OPERATED MACHINE TOOLS FiledAug. 3, 1940 2 Sheets-Sheet l ATTORNEYS PMA 2,487,812 ALLY N0V 15, 1949E. H. KocHx-:R

LUBRICANT PUMP FOR HYDRAULIC OPERATED MACHINE TOOLS 2 Sheets-Sheet 2Filed Aug. 3, 1940 lNvENToR Edward b. [foo/1er BYZ 4 ATTORNEYS PatentedNov. 15,` 1949 LUBRICAN T PUMP FOR HYDRAULICALLY OPERATED MACHINE TOOLSEdward H. Kocher, Boonton, N. J., assignor to Auto Research Corporation,a corporation of Delaware Application August s, 1940, serial No. 350,647

'7 Claims.

The present invention relates to machine tool constructions, and itparticularly relates to lubricated machine tool installations.

Although not restricted thereto, the present invention will beparticularly described in connection with its application to lubricationof machine tool constructions which have in and about the machine tool asource of intermittent or varying oil or hydraulic pressure, and whichmachine tools have built therein an installation for supplying minute,yet accurately proportioned, rquantities of lubricant to the variousbearings in andv about the same requiring lubrication.

It is among the objects of the present invention to provide an improvedmachine tool construction of the character described, in which withoutmechanical drive or Without driving gears or levers, it will be possibleto build unitarily therein means for lubricating and supplying lubricantto the various bearings in and around the machine tool, which lubricantwill be supplied automatically by power derived from an intermittent oilor hydraulic pressure source in and around the mechanism to belubricated.

Still further objects and advantages will appear in the more detaileddescription set forth below, it being understood, however, that thismore detailed description is given by way of illustration andexplanation only and not by Way of limitation, since various changestherein may be made by those skilled in the art without departing fromthe scope and spirit of the present invention.

In accomplishing the above objects, it has been found most satisfactoryaccording to one embodiment of the present invention, to provide adistributing conduit or bore system in and around the mechanism to belubricated, having a single inlet from the lubricant pressure source andleading to the bearings to be lubricated, which bore system will carry aplurality of highly restricted full metering outlets affording atremendously greater obstructing effect to the ow of lubricant than thetubing or bores extending through the mechanism or of the bearings to belubricated.

In the preferred construction, the pressure source is positioned at oradjacent to a pocket cr recess receiving a body of lubricant which maybe replenished and which may be provided with indicator means to showwhen the lubricant has been or is about to be exhausted.

In the desired form of the invention, the source of lubricant pressureconsists of two aligned reciprocating pressure-responsive or creatingdevices, one forming Aa pump and consisting of an elongated unpackedplunger fitted in an elongated body having a central bore, said bodycarrying suitable inlet and outlet ball checks and an inlet flow filter.

Connected to and supporting the body, is preferably a bracket desirablyof U-shape, the base of which is connected to the side of the pocket orrecess in the mechanism to be lubricated.

One leg of the U preferably carries the pump body, While the other legdesirably forms a bearing for a connecting rod which serves as aconnection to a suitable pressure responsive motor, preferably of thepiston cylindervariety. The cylinder of the motor is connected tothesource of intermittent or varying hydraulic or oil pressure in andabout the mechanism to be lubricated.

In the drawings which show one of the various possible embodiments whichmay be constructed according to the present invention, but to which theinvention should not be restricted, since this embodiment is merelyillustrative, Y

Fig. 1 is a longitudinal sectional view of one form of a centralpressure source which may be associated with a mechanism of the typepreviously described;

Fig. 2 is a side elevational line 2-2 of Fig. 1;

Figs. 3 and 4 are respectively side elevations in partial longitudinalsection of alternative pump units; 'Y

Fig. 5 is a longitudinal sectional view of one type'of ow meteringoutlet fitting;

Figs. 6 and 7 are respectively elevational and sectional views of analternative hydraulic motor, Fig. 7 being taken upon thek line 1-1 ofFig. 6, said motor being used with a piston pump of the view taken uponthe character shown in Figs. l, 2, 3 and 4;

Fig. 8 is a transverse sectional view of still another alternativehydraulic motor construction which may be utilized in connection withthe piston pumps in Figs. 1, 2, 3 and 4.

Referring to Figs. l and 2, the pressure source essentially consists ofa U-shaped bracket A, va hydraulic or oil pressure motor B, and va pumpunit C. 'The pump unit C is provided with an inlet filter D, an inletcheck valve unit E, and an outlet check valve unit F. The pump unitincludes the elongated unpacked piston plunger ID, which fits in a boreII in the body C of the unit, said body preferably, for example, beingof hexagonal brass stock.

The bore I I is enlarged at I3 to form a chamber for receiving thelubricant and from which the lubricant is discharged upon reciprocatingmovement of the elongated plunger I0.

The bottom of the body I2 is provided with a 3 tapped recess I4 whichreceives the body I5 of the ball check unit E. This body is providedwith a central passage therethrough, receiving the spring seated ballcheck I6, and is provided with the valve seat I1.

The lower end of the body I2 is provided with the cup shaped member I|8in which is positioned the lter screens I9 and the lter pad 20 held inposition by the ring 2 I.

The side of the body I2 is provided with a tapped recess 22 receivingthe threaded end of the body 23. The body 23 Yreceives the spring seatedball check 24 and has a tapped connection 25, enabling it to be coupledto an outlet tube.

The upper end of the body lf2 is of reduced diameter and threaded, asindicated at 26, and it is received in the opening 2? on the leg 28 ofthe bracket A. The nut 29 clamps the leg 28 firmly against the shoulder30 on the body I 2.

The base 3| of the bracket is provided with the outstanding ears 32 (see2), which receive the bolt holes 3T3.

The upper leg 34 of the bracket is provided with an opening 35, intowhich .projects the threaded portion 36 receiving the nut 31., whichvclamps the shoulder 33 against :said leg 34.

The hydraulic motor unit B has a body 39 having a central bore f40,which receives the piston member 4I. The upper portion of the bore isthreaded, as indicated at 42, and receives an adjustable stop screw 43.having a head 44 and a locking -nut 45.

The stop screw 43 has a projecting nipple 46 which forms a stop for theupper end 41 of the piston member 4|.

The body 89 is provided with `a transverse bore 48, which is tapped aty4S to enable connection to a suitable source S of intermittenthydraulic or oil pressure in or about the mechanism to be lubricated orother source of lubricant pressure. The piston 4| is provided with aconnection at '50 to the upper end of the connecting rod or member I ofthe same construction as the lower end of the rod 5|, similarlyfunctioning parts being indicated by the same `numerals primed.

The element 5| is provided with a transverse opening `52, whichvreceives a pin 53 holding in position the spring reaction Washer orplate 54. The coil spring 55 encircles the lower end of the element 5|and reacts against said washer 54 and against said nut 29 `and tends topress the upper end 41 of the piston 4I against the ladjustable stop 46.The lower end `of the member 5| is provided with a recess 56, whichreceives the mushroomed head 51 of the piston I0, pressed downwardly bythe spring 58.

In the device shown in Figs. 1 and 2, when pressure is applied to theinlet 48 of the -unit B, the piston 4I will be forced downwardly,compressing the spring 55 and moving down the piston I0. This willcau-se a discharge lstroke `and lubricant will be ejected past theloutlet ball check 24 toward the bearings to be lubricated. Whenpressure is released through the inlet 48, the spring 55 will expand,moving the .piston 4| up against stop 46 and moving the piston I0upwardly, which will draw a charge of lubricant into the chamber 'I 3past the iilter'D and the inlet ball check E.

The unit as shown is particularly suitable for use in connection with ahydraulically operated broach in which the hydraulic pressure will varywith each stroke of the broach. The piston as shown may have a strokeranging from about 1/8 to l of an inch, with a .piston size of fromabout Tae to of an inch, and the unit as shown may have an over-alllength of 75%; inches, and a maximum width of about 2 inches.

In the construction of Figs. 3 and 4, correspondingly functioning partsof those as shown in Fig-s. l and 2 are indicated by the same lettersand numerals,V however, respectively provided v/itha superior 2 and asuperior 3.

In the construction of Fig. 3, the reservoir cover |50, having the inletopening |5|, carries the bracket A2. The outlet connection I I |2 has acoupling connection at |52 to a socket |53 in `the cover, which connectsto an external distribution system (not shown).

The Acover |55 is provided With a sleeve |54, which encircl-es theconnecting rod 5|2. The Esleeve |54 extends upwardly into the chamber|55 4formed on the top of the cover |50 and provided with the passage|56 which may be connected by the tapped socket |51 to a conduit todrain any escaped hydraulic uid back to the hydraulic reservoir.

The chamber |55 serves to collect any leak which -ows past the hydraulicpiston 4|2, and the upper end |58 of the sleeve |54 is sufficiently highto prevent overlow of vhydraulic iluid into the interior of thelubricant reservoir which -is covered by the element |50.

rihe upper end of the connecting rod :has a reduced diameter threadedportion |59, which receives the stop disc |611.

The interiorly threaded sleeve lIII xes the body 392 to the cover |62 ofthe upper chamber |55. The inlet connection 482 is at the tcp of thehydraulic motor body 392. and the adapter |63 connects the chamber 402through said inlet socket 482 to a source `of changing hydraulicpressure. v

In the construction of Fig. 4, the U-shaped bracket A3 may .be of thesame construction as A in Fig. 1; and the pur-np C3 of the same constrution Aas 1C in Fig. l.

The connecting rod 513 is provided Vwith an upper threaded portion|593., which receives the nuts |64 vand |65, the nut |65 beingadjustable and being ylocked in 'adjusted position by the nut |64 uponthe threaded shank |593 to adjust the stroke.

The hydraulic pis-ton 4|3 .has a reduced lower end portion |66 whichcontacts the upper end |61 of the connecting rod 5|3.

The hydraulic pressure connection in Fig. 4 .is made as in Fig. 3, tothe end of the body 393, through the inlet socket 483.

A typical outlet meter unit .as shown in longiif tudinal sectional View,Fig. 5, is provided with Va body |91 having a bore |98 which issubstantially completely filled by the pin |99. The pin |99; forms acrevice with the bore |98 of the 4order of one to several thousandthsVof an inch, which has a substantially greater restricting 'effect thanthe conduit system 'of a bearing.

Each flow metering unit has an 256 and an outlet check valve 20|.

In Figs. 6 and 'I is shown an alternative vhydraulic motor constructionin which the sieeve 35i), has a bore 35| that receives the motor pistonV362. The sleeve 360 is exteriorly .provided with' a series 'of marking'rings V303, 394, 305 and 366, carrying different graduations ornumerals thereon.

The upper portion of the sleeve 309 fis threaded, as indicated at 391,and receives a cap 358. The strainer 3|0 having the upper Aand vlowerscreens 3H and 3|2, is clamped between the shoulder.

inlet strainer 3|3 `oi-,the cap 300 and the .top portion 3|4 oflthe'sleeve 300. Y .I i'

`I'helower portion of the sleeve 308 is threaded at3|5 and-it receivesAthe threaded sleeve portion 3|6 vof the tapered member 3|'|., Thesleeve SI5 is threaded into the opening 3|8 in the top oi the cap 3|9,said cap being attached to the chamber 320..:y j vThe lower end Vof thesleeve300 is provided with 4the out turned portions 32| which receivethe washer 322. The connecting rod 323, which extends downwardly to apump (not shown) of the same construction as already described inconnection with Fig. 1, has a threaded reduced diameter portion 324 atthe top thereof, which receives the stop disc 325, the upper face ofwhich contacts the down turned portion 32|.

It will be noted by reference to Fig. 6, that the sleeve 3|'| has a mark326 above the hexagon portion 321, which enables turning off said sleeve3I1 until the mark coincides with one of the numerals on the rings 303to 306. This will enable adjustment of the stroke of the connecting rod323 and the discharge of the pump.

In the motor construction shown in Fig. 8, the

bracket A4 has the leg 344 which carries the hydraulic motor B4 and thelegs 234 which carries the pump C4. The piston 4|4 of the hydraulicmotor is received in the bore 404 and it has a reduced diameter portion564 which contacts the upper threaded portion |594. The portion |584receives the lock nut |644 and the adjusting nut |654. The lock nut |644has an upwardly extending sleeve 350 which contacts the lower end 3254of the threaded portion 3|84 of the hydraulic motor B4. By changing theposition of the nuts |644 and |654, it is possible to vary the stroke ofthe piston |04.

Between the cap 3084 and the nipple portion 3|44 is clamped the lter orstrainer 3|04 with its facing metal screens 3| I4 and 3|24.

rIhe strainers 3|| of Fig. 7 and 3| |4 of Fig. 8, will prevent any chipsor dirt from getting into the cylinder formed by the bores 30| in Fig. 7or 484 in Fig. 8.

In operation, the hydraulic pressure supplied to the hydraulic motor Bwill either be varied upon turning on or turning ofi the machine or anautomatically actuated valve may be provided to turn on and turn off thehydraulic pressure intervals so that the piston I0 will be caused toreciprocate to discharge lubricant into a distributing system with flowmetering outlet ttings as indicated in Fig. 5.

In this manner assurance will be had that the lubricating installationwill be fed lubricant during operation of the machine, which lubricantin turn will pass to the bearings.

In Figs. 4 and 8, the adjustment is made by unlocking the nuts |84 and|644 and changing the position of the stop members |65 and |654.

In Fig. 6, the rings 303 to 306 indicate respectively 1/8, 1/4 and 3/8of an inch strokes, with the maximum stroke being 1/2 of an inch.

By turning the nut 303 and bringing the mark 326 opposite one of thefractional numerals, the stroke can thus be controlled.

It will be understood that many changes could be made in the particularfeatures of mechanism as shown, and many apparently Widely differentembodiments of this invention could be made without departing from thescope thereof, and it is intended that all matter contained in the abovedescription shall be interpreted as illustrative and not in a limitingsense.

What is claimed is:

1. In a hydraulically driven machine tool, a` lubricant pressure sourcevfor a centralized branched lubricating installation with highrestriction, ilow metering outlets, comprising twovertically-positioned, axially-aligned elongated unpacked hydraulic andlubricant piston plungers, elongated axially aligned hydraulic andlubricant cylinder members embracing said plungersyand having'inlet andoutlet connections lfor hydraulic pressure and lubricant respectivelyadjacent the top'a'nd bottom of said 4cylinder inembers, a U-shapedbracket having its upper leg supporting said hydraulic cylinder and itslower leg supporting said lubricant cylinder, a connecting rod connectedto move with the upper end of the lubricant plunger, but merelycontacting the lower end of the hydraulic plunger, a return oil springencircling said connecting rod and a threaded adjustment positionedadjacent the point of contact of the connecting rod and the hydraulicplunger to change the position of the point of contact.

2. In the source of claim 2, said adjustment included a threaded portionon the hydraulic cylinder member and a threaded sleeve on said threadedportion regulating the position of said threaded portion.

3. In the source of claim 2, said connecting rod having a threadedportion and a threaded sleeve on said threaded portion to regulate theposition of said threaded portion.

4. In a lubricant pressure pump, a hydraulic plunger, a connecting rodcontacting the adjacent end of said plunger, a lubricant plunger havinga spring pressed ball and socket connection to said connecting rod and areturn coil spring connected to said connecting rod and positionedbetween said plungers, and hydraulic and lubricant cylinder membersreceiving said plungers,

`said plungers, cylinder members, connecting rod and coil spring beingall axially aligned, and means to adjust said connecting rod and to varythe effective length thereof.

5. In a lubricant pressure pump, a hydraulic plunger, a connecting rodcontacting the adjacent end of said plunger, a lubricant plunger havinga spring pressed ball and socket connection to said connecting rod and areturn coil spring connected to said connecting rod and positionedbetween said plungers, and hydraulic and lubricant cylinder membersreceiving said plungers, said plungers, cylinder members, connecting rodvand coil spring being all axially aligned, and means to adjust saidcylinder members together or apart.

6. In the pump of claim 4, said means including an adjustable sleeve onsaid connecting rod.

7. In the pump of claim 5, said means including an adjustable sleeve onsaid hydraulic cylinder member.

EDWARD H. KOCHER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNlTED STATES PATENTS Number Name Date 298,836 Dearing May 20, 1884458,450 Fitzgerald Aug. 25, 1891 828,326 Manzel Aug. 14, 1906 1,121,637Kreiss Dec. 22, 1914 (Other references on following page) 'UNITED STATESPATENIS Number Number Name Date 1,751,423 Woodrui June 3, 1930 .22245021,739,195 sagre Jan. 13, 1931 1 1,364,195 Han June 21, 1932 5 222510951,333,300 'Kreidel July 23, 1932 1,397,300 mouse Feb.14, 1933 2,070,574Bij-ur Feb. 1s, 193': Nqggegm 2,072,001 Guthans Feb, 23, 1937 '399111 42,101,929 Buur aan. 11,1933 1 2,140,933 carter 1330.20, 1933 Name DateBijur Feb. 7, 1939 Goldberg July 325., 1939 Grad Dec. 10, 1940 KocherJan. 21, 1941 FOREIGN PATENTS Country Date 'Germany Oct. 10, 1'913Germany July 19, 1924

